CN105323907A - Switched mode power supply - Google Patents
Switched mode power supply Download PDFInfo
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- CN105323907A CN105323907A CN201510303313.9A CN201510303313A CN105323907A CN 105323907 A CN105323907 A CN 105323907A CN 201510303313 A CN201510303313 A CN 201510303313A CN 105323907 A CN105323907 A CN 105323907A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A switched mode power supply comprising: a rectified voltage terminal and a rectified ground terminal for receiving a phase-cut rectified voltage; a power switch and an inductive element connected in series between the rectified voltage terminal and the rectified ground terminal; a switch controller having a floating ground terminal and a dimming input terminal, wherein the dimming input terminal is for receiving a dimming voltage signal indicative of a required dimming level, wherein the switch controller is configured to control the switch in accordance with the dimming voltage signal and wherein the inductive element is connected between the rectified ground terminal and the floating ground terminal; and a dimming level controller configured to set the dimming voltage signal in accordance with the rectified phase-cut voltage with respect to the floating ground terminal.
Description
Technical field
The disclosure relates to switched-mode power supply, and specifically and not exclusively, relates to a kind of buck-boost (buck-boost) of applying for tunable optical solid-state illumination (lighting) and flyback (flyback) transducer.
Background technology
Including but not limited to throw light in the application of application, tangent dimmer is used widely.Phase dimmer uses switch to disconnect or to cut off a part for mains cycle (more accurately, half period).
Fig. 1 a shows on an AC cycle (be 0.02s for 50Hz power supply usually, or for 0.17s during 60Hz power supply) relative to the tangent rail voltage signal 1 in the forward position of time.Phase corner cut 2 determines the amount of the energy lost in AC rail voltage.According to the type of switch used, forward position or even both the cut-outs of rear edge of phase place can be cut off.For rear along tangent dimmer, can along the voltage axis mirror image waveform shown in Fig. 1 a, and average voltage is identical with the average voltage of the tangent rail voltage signal in forward position 1.Fig. 1 b shows the rectified signal 3 corresponding with tangent rail voltage signal 1.In general, transistor or triode ac switch (triac) are for cutting off rail voltage signal, and bridge rectifier can be used for rectified signal.
Although this dimming controlling method to conventional incandescent illumination effectively, but work as tangent dimmer and be not suitable for processing the more energy-saving lighting of mains cycle " loss " part (such as, the illumination of compact fluorescent illumination (CFL), tubular type (TL) or solid-state illumination (SSL)) when using together, will problem be caused.Usually this kind of energy-saving lighting is controlled by the switched-mode power supply comprising the switch operated under the frequency (normally a few kHz is to a few MHz) more much higher than 50Hz or 60Hz mains cycle.
For the tangent dimmer with this kind of compatibility of throwing light on, need to process can be used for lighting circuit tangent power supply.But, importantly in this process, be brightness adjustment control level signal by the Information recovering relevant with expecting light modulation level be included in tangent signal.
Summary of the invention
According to a first aspect of the invention, provide a kind of switched-mode power supply, comprising:
Commutating voltage terminal and rectification earth terminal, for receiving the tangent voltage of rectification;
Mains switch and inductance unit, be connected between described commutating voltage terminal and described rectification earth terminal;
On-off controller, there is floating ground terminal and light modulation input terminal, wherein said light modulation input terminal is for receiving the dimmer voltage signal of the required light modulation level of instruction, described on-off controller is configured to switch according to described dimmer voltage signal controlling, and described inductance unit is connected between described rectification earth terminal and described floating ground terminal; And
Adjust light level controller, be configured to arrange described dimmer voltage signal according to the tangent voltage of described rectification relative to described floating ground terminal.
Described dimmer voltage signal can be provided with reference to floating.Adjust light level controller can be configured to by described dimmer voltage signal setting be within one or more half periods of tangent commutating voltage the tangent voltage of described rectification relative to the mean value of described floating ground terminal.
Described switched-mode power supply also can comprise the voltage divider with the first voltage grading resistor and the second voltage grading resistor.Described voltage divider can be connected between the tangent voltage terminal of described rectification and described floating ground terminal.Described dimmer voltage signal can be used by the Nodes between described first voltage grading resistor and described second voltage grading resistor.Described switched-mode power supply also can comprise and is connected on Zener diode between the tangent voltage terminal of described rectification and described floating ground terminal and average capacitor.Described average capacitor has the first pole plate and the second pole plate.Described second pole plate can be connected to described floating ground terminal.Described first pole plate can be connected to described Zener diode via described first bleeder circuit.Described first pole plate and be connected to described first voltage grading resistor.Described first voltage grading resistor can in series be arranged between described Zener diode and described average capacitor.Described second voltage grading resistor can be in parallel with described average capacitor.Described first pole plate can be configured to provide dimmer voltage signal.
Described switched-mode power supply also can comprise the bias capacitor with the first pole plate and the second pole plate.First pole plate of described bias capacitor can be connected to the node between described Zener diode and described first voltage grading resistor.Second pole plate of described bias capacitor can be connected to described rectification earth terminal.
Described average dimmer voltage signal can be:
Wherein
represent light modulation phase corner cut, V
mains+the root mean square line voltage distribution at input terminal place, V
dthe voltage drop of bridge rectifier, V
zzener OFF state (stand-off) voltage, and V
eSRit is the voltage drop in described inductance unit.
Described switched-mode power supply can comprise the additional resistance be connected between described light modulation input terminal and reference voltage, to provide the fixed bias to described dimmer voltage signal.
Described switched-mode power supply can comprise the filter circuit be connected between described mains switch and described commutating voltage terminal.Described switched-mode power supply can comprise the filter circuit be connected between described commutating voltage terminal and described rectification earth terminal.Described filter circuit can be configured to stop and be added to or disturb tangent commutating voltage at described commutating voltage terminal and described rectification node terminal place from the electromagnetic noise of described switched-mode power supply.
Described inductance unit one of can to have than 0.5,1,2,5,10,20 or 50 ohm little resistance.Described resistance can in the scope of 0.1 to 20 ohm.
Described switched-mode power supply can comprise buck-boost (buck-boost) transducer.
Described switched-mode power supply can comprise flyback converter.Described inductance unit can be the winding of the transformer of described flyback converter.Described inductance unit can be the armature winding of described transformer.
Described tune light level controller and described on-off controller can be set up in a single package.Described mains switch also can be arranged in this single package.
A kind of computer program can be provided, make when it runs on computers allocation of computer comprise any device of circuit, controller, switched-mode power supply or any equipment disclosed herein or perform any method disclosed herein.Computer program can be software simulating, and as limitative examples, computer can be considered to any suitable hardware of the realization comprised in digital signal processor, microcontroller and read-only memory (ROM), Erasable Programmable Read Only Memory EPROM or Electrically Erasable Read Only Memory.Software can assembler.
Computer program may be provided on computer-readable medium, and described computer-readable medium can be physical computer-readable media, such as dish or memory device, or can be embodied as transient signal.This transient signal can be the web download comprising the Internet download.
According to of the present invention many-sided, provide the solid-state lighting unit that one comprises any switched-mode power supply (SMPS) disclosed herein.
Accompanying drawing explanation
By way of example, with reference to accompanying drawing, one or more embodiment of the present invention is described, wherein:
Fig. 1 a shows tangent rail voltage signal;
Fig. 1 b shows the tangent rail voltage signal of rectification;
Fig. 2 shows the rough schematic view of downside (lowside) buck-boost light modulation transducer;
Fig. 3 shows the rough schematic view of a part for high side (highside) buck-boost light modulation transducer;
Fig. 4 shows the rough schematic view of the high side buck-boost light modulation transducer similar with Fig. 3;
Fig. 5 shows the signal overview from Fig. 4 circuit;
Fig. 6 shows another schematic diagram of the high side buck-boost light modulation transducer similar with Fig. 3;
Fig. 7 shows the dimming control voltage curve relative to phase corner cut arranged by the buck-boost light modulation transducer of Fig. 6.
Embodiment
Solid state light emitter is the more and more common selection in order to alternative incandescent light source.Compare corresponding incandescent light source, the energy consumption of various solid state light emitter is much lower, and this is also this alternative major contributory factor.But in application widely, the cost of implementation remains the key factor that will minimize or reduce.
For being easy to realize and cost consideration, the power supply of a lot of tunable optical solid-state illumination application is relevant with low side drive dc-dc converter.In flyback or buck-boost switched-mode power supply (SMPS), according to tangent rectified mains signal (such as discussing with reference to figure 1b), regulate the duty factor of mains switch and switching frequency, can the electric power of control SMPS export.
Fig. 2 shows the rough schematic view of downside buck-boost light modulation transducer SMPS5.SMPS5 comprises inductor L_bb, mains switch M1, on-off controller 6 and adjusts light level controller 7.SMPS5 is configured to receive tangent rail voltage at the main line input terminal 8 of SMPS5.By rectifier 9, tangent rail voltage is converted to tangent commutating voltage V
rECT.
In this illustration, voltage surge proterctive equipment is set between the main line input terminal 8 of SMPS5, such as RMOV (metal oxide piezo-resistance) Transient Voltage Suppressor.In addition, between main line input terminal 8 and rectifier 9, fuse is connected.
Rectifier 9 is the bridge rectifiers of four diode D1 to D4 with bridge configuration.The bridge configuration of diode D1 to D4 is connected to i) main line input terminal 8 and ii) between commutating voltage terminal 10 and rectification earth terminal 12.By rectifier 9, relative to the rectification ground of rectification earth terminal 12, provide tangent commutating voltage V at commutating voltage terminal 10 place
rECT.
In this illustration, mains switch M1 is set by mos field effect transistor.The conductive channel of mains switch M1 is connected with inductor L_bb.The arranged in series of mains switch M1 and inductor L_bb is connected between commutating voltage terminal 10 and rectification earth terminal 12.Due to low side drive SMPS5, inductor L_bb is connected between the conductive channel of commutating voltage terminal 10 and mains switch M1.That is, say from current potential, mains switch M1 lower than inductor (closer to rectification ground).
Inductor L_bb is the part in buck-boost loop.Buck-boost loop also comprises buck-boost diode Dfast and output unit 14.Output unit 14 represents the load of SMPS5 and comprises the buffer condenser Cbuf and LED strip D6 and D7 that are arranged in parallel.Buck-boost diode Dfast and output unit 14 are one another in series and common in parallel with inductor L_bb.
On-off controller 6 is arranged by tunable optical SMPS on-off controller, such as SSL2101, illustrate see product data, NXPB.V. " DimmableGreenChipdriverforLEDlighting ", Rev.4.1, on December 5th, 2011, online access " http://www.nxp.com/documents/data_sheet/SSL2101.pdf ").In this illustration, on-off controller 6 has six terminals, comprising:
1) integrated circuit (IC) earth terminal GND, is connected with rectification earth terminal 12;
2) current-sense terminal SEN, is connected with rectification earth terminal 12 via sensing resistor Rsns;
3) IC voltage terminal Vcc, receives the supply power voltage being used for integrated circuit from commutating voltage terminal 10;
4) control terminal GT, the grid to mains switch M1 provides control signal;
5) light modulation input terminal DIM (relevant with the brightness pin of SSL2101), reception refers to
Show the dimmer voltage of required light modulation level; And
6) when border conduction mode detection terminal (not shown), from inductor L_bb Received signal strength, arrive zero for making the energy in controller determination inductor L_bb.Border conduction mode detection terminal is connected with the drain electrode of mains switch M1.
For meeting radiation regulation, additional filterings circuit 16 is set between IC voltage terminal Vcc and commutating voltage terminal 10.Filter circuit 16 is configured to stop gets back to main supply from the electromagnetic interference of SMPS5.Regulating circuit 16 comprises and the optional adjustment diode D5 regulating inductor Lf to connect.IC voltage terminal Vcc is connected with filter inductor Lf.Regulate diode D5 and regulate the node between the first terminal of inductor Lf to be connected with rectification earth terminal 12 via the first regulating capacitor CF1.Between the second terminal that second regulating capacitor CF2 is connected to adjustment inductor Lf and commutating voltage terminal 12.Be appreciated that the circuit shown in Fig. 2 is one and simplifies example, can additionally or alternatively provide other assemblies in filter circuit 16, with console switch controller 6.
On-off controller 6 is used as switch switching unit, and it is configured to make mains switch M1 to switch with from main line input terminal 8 to output unit 14 transmitting energy between off-state and on-state.Switch switching unit definition comprises the switching cycle of main stroke (primarystroke) and time stroke (secondarystroke).During main stroke, mains switch M1 connect and in inductor L_bb stored energy.During secondary stroke, mains switch M1 disconnects and by the Energy Transfer that is stored in inductor L_bb to output unit 14.Switch control rule 6 is configured to, according to dimmer voltage signal control power supply switch M1, to provide output current according to required light modulation level.
The tune light level controller 7 of SMPS5 is configured to, and according to the tangent voltage of rectification, arranges dimmer voltage signal relative to rectification earth terminal.By intercepting the circuit shown by part in Fig. 2, provide exemplary dim level controller 7.
Adjust the voltage divider that light level controller 7 comprises Zener Zener diode Dz and is connected between commutating voltage terminal 10 and rectification earth terminal 12.Voltage divider has the first voltage grading resistor Rdiv1 and the second voltage grading resistor Rdiv2.First voltage grading resistor Rdiv1 is arranged between Zener diode Dz and the second voltage grading resistor Rdiv2.Average capacitor Cavg is in parallel with the second voltage grading resistor Rdiv2.Dimmer voltage signal can be used at the node/Nodes of the first voltage grading resistor Rdiv1 and the second voltage grading resistor Rdiv2.Can think, provide dimmer voltage signal by first pole plate of the average capacitor Cavg be connected with the node between the first voltage grading resistor Rdiv1 and the second voltage grading resistor Rdiv2.Second pole plate of average capacitor Cavg is connected with rectification earth terminal 12.Average capacitor Cavg is to the tangent commutating voltage V relative to rectification ground
rECTbe averaging.
Owing to being in use arranged as so that reverse bias, by Zener diode Dz from tangent commutating voltage V
rECTdeduct a voltage.There is provided comparatively low-key photoelectric signal with less rail voltage phase corner cut, can provide lower light output with comparatively ditty photoconduction electric angle, therefore solid-state lighting unit can imitate the character of incandescent lamp bulb better.
The maximum voltage of the light modulation input terminal DIM of controller 6 can be less than 5V.Voltage divider is further used for reducing tangent commutating voltage and makes the rated voltage of the light modulation input terminal DIM of tangent commutating voltage and on-off controller 6 suitable.
Can think by adjusting light level controller 7 to provide average circuit, this is because adjusting light level controller 7 to be configured to is average relative to the ratio of the rectification tangent voltage VRECT on rectification ground within one or more half periods of tangent commutating voltage by dimmer voltage signal setting.Average level and Fig. 1 b illustrate that the integration of curve is relevant.
In SMPS5, LED strip D6 and D7 is with reference to rectified voltage signal (positive output).On-off controller and tune light level controller 7 are with reference to rectification ground.Therefore, SMPS5 provides a kind of according to rectified mains voltage V
rECTand adjust the simple interaction between light level controller 7 and switch control rule 6 to derive the straightforward procedure of dimmer voltage signal.
For providing the correct average of mains input voltage, adjust light level controller 7 with reference to rectification ground.For low side switch SMPS5, the earth terminal of on-off controller 6 with reference in the same manner (rectification ground), therefore, on-off controller 6 and adjust light level controller 7 direct interaction; Together with the controller 6 that opens the light can be connected directly between with the earth terminal of tune light level controller 7.
But there are some shortcomings, as follows in the design of low side driver:
1. dc-dc converter may need add-on assemble to provide excess voltage protection, is not damaged (such as, exploding) for the protection buffer capacitor Cbuf when LED strip D6 and D7 forms open circuit because of some reasons (such as, solder joint failure).May need to provide auxiliary winding can sense voltage conditions to make on-off controller 6 and suspend switching.This additional winding adds the cost of inductance unit.
2. the circuit of relative complex may be needed with accurate adjustment LED output current, this is because in low side driver 5, have to determine output current with comprising to the on-off time ratio of the compensation of the imperfect behavior of switch (such as switch time delay) according to maximum inductor current.
Secure isolation near the fin of 3.LED string must be and the AC that is coupled of rectification ground.In low side drive system, realize coupling by the capacitor (this means system requirements add-on assemble) arranged between Secure isolation and rectification ground.
Fig. 3 shows the schematic diagram of a part for high side buck-boost light modulation transducer (SMPS) 30.SMPS30 can be used for providing such as solid-state lighting unit.The problems referred to above that the downside SMPS that high side drives SMPS30 can solve Fig. 2 runs at least partially.Below with reference to another specific implementation in concrete (simplification) realization in Figure 4 and 5 and Fig. 6 and 7, the function of the SMPS30 of Fig. 3 is discussed further.
SMPS30 has on-off controller 6 ', adjusts light level controller 7 ', mains switch M1 and inductor L_bb.Inductor L_bb is an example of inductance unit.Adjust light level controller and on-off controller can arrange in a single package.Mains switch also can be arranged in this single package.
SMPS30 also has for receiving tangent rectified voltage signal V
rECTcommutating voltage terminal 10 and for receiving rectification ground signalling GND
rECTrectification earth terminal 12.Except rectification earth terminal 12, the on-off controller 6 ' that high side realizes also needs the floating ground terminal 13 be separated, to make on-off controller 6 ' driving power switch M1.Needing two to be separated earth terminal makes added circuit complexity increase a rank.But the arrangement of components in the SMPS30 of Fig. 3 makes on-off controller 6 ' directly can measure actual inductive current on main stroke and time stroke, can also the direct sensing converter output voltage equal with the voltage at inductor L_bb two ends in secondary stroke.The level (normally a few volt) that resitstance voltage divider can process for the voltage magnitude (such as, 20V to 200V) on inductor L_bb being zoomed to on-off controller 6 '.This topological structure can exempt the needs for additional level shift circuit (such as, comprising current mirror, photoelectric coupling or transformer).Below in conjunction with the concrete example of Fig. 4, provide the more details of the operation of this SMPS30.
Mains switch M1 and inductor L_bb is connected between commutating voltage terminal 10 and rectification earth terminal 12.Mains switch M1 and inductor L_bb need not directly be connected with each other.Mains switch M1 in high side, that is, between inductor L_bb and voltage terminal 10.Mains switch M1 also need not be directly connected to voltage terminal 10.Such as, between mains switch M1 and voltage terminal 10, can filter circuit be set, to prevent high-frequency current with crossing input terminal and therefore causing electromagnetic interference.Similarly, inductor L_bb need not be directly connected to rectification earth terminal 12.
On-off controller 6 ' has multiple terminal, comprising:
Floating ground terminal GND, for being connected to the floating ground terminal 13 of SMPS30;
Light modulation input terminal DIM, for receiving the dimmer voltage signal of the required light modulation level of instruction; And
Gate terminal GATE, for according to dimmer voltage signal control power supply switch M1.
Adjust light level controller 7 ' also to have multiple terminal, comprising:
Commutating voltage terminal RECT, for receiving the tangent voltage signal V of rectification from the commutating voltage terminal 10 of SMPS30
rECT;
Floating ground terminal GND, for being connected to the floating ground terminal 13 of SMPS30; And
Light modulation lead-out terminal DIM.
Can tune light level controller 7 ' be regarded as light modulation phase angle, high side testing circuit.Light level controller 7 ' is adjusted to be configured to, floating relative to floating ground terminal 13 place, the dimmer voltage signal at light modulation lead-out terminal DIM place is set according to the tangent voltage of rectification, and can operates according to the mode similar to the tune light level controller described with reference to figure 2.Adjust the light modulation lead-out terminal DIM of light level controller 7 ' to be connected with the light modulation input terminal DIM of on-off controller 6 ', therefore, adjust light level controller 7 ' to be configured to provide dimmer voltage signal to the light modulation input terminal DIM of on-off controller 6 '.
Inductor L_bb is connected between rectification earth terminal 12 and floating ground terminal 13.Therefore, mains switch M1 is in the current potential higher than inductor L_bb.Ideal inductor does not have resistance.Actual inductance utensil has the resistance of such as 0.1 to 20 ohm.In actual design, this means according to light modulation level, LED current amplitude and inductor type used, between floating and rectifier ground, there is the voltage drop of 10mV to number V.The voltage range (such as, 0.3 to 2V) inputted with the brightness adjustment control of on-off controller 6 is compared, and this voltage is comparatively large, but compares then less with the amplitude (such as, 30 to 200V) of rectified mains voltage.Therefore, inventor has recognized that, by forming the dividing potential drop of the rectified mains with reference to floating ground, can obtain suitable dimming control signal: the average voltage drop at inductor two ends is connected with rectified input voltage effectively, therefore, very little on the mean value impact of voltage division signal.This can advantageously with relatively less and the assembly of cost-effective realizes SMPS30.In addition, the level shift circuit added can therefore do not needed.
Connection and the operation of high side SMPS configuration are discussed further below with reference to Fig. 4 to 7.This SMPS can provide and be easy to realize and the high side AC tangent tunable optical solid-state light current source of cost-effective.
Fig. 4 shows the rough schematic view of high side buck-boost light modulation transducer.Except following by except two features relating to DET pin and SEN pin of description, on-off controller 6 ' itself provides by the same circuits of the on-off controller of the downside transducer with Fig. 2, and except the connection of on-off controller 6 ', circuit arrangement is similar to Fig. 2.The layout of on-off controller 6 ' is similar to the layout described with reference to figure 3.Therefore, these assemblies need not describe again at this.
The IC earth terminal GND of on-off controller 6 ' is connected to floating ground terminal 13, and these are different with being connected to rectification earth terminal 12 in the downside transducer of Fig. 2.
In this illustration, border conduction mode detection terminal DET is set discretely with IC earth terminal GND.Border conduction mode detects the voltage referring to sensing inductor two ends.
In this illustration, buck-boost loop comprises sense resistor Rsns.Sense resistor Rsns is connected between buck-boost diode Dfast and inductor L_bb.The sensing terminals SEN of on-off controller 6 ' is connected to node/node between sensing resistor Rsns and buck-boost diode Dfast.Inductor L_bb is connected between rectification earth terminal 12 and floating ground terminal 13.By only measuring the average voltage at Rsns two ends during secondary stroke, on-off controller can easily determine the actual current flowing through load, and adjust the turn-on time (on-time) of switch, match with the voltage being supplied to light modulation input terminal DIM to make output current.
LED strip D14, D15 are connected between buck-boost diode Dfast and rectification earth terminal 12.In this illustration, the positive plate of LEDD14, D15 can be directly connected to the Secure isolation of fin of LED strip D14, D15, isolation and rectification to be connected.Because the anode of LED strip D14, D15, can without the need to the building-out condenser for providing the connection in low side drive circuit in the topological structure of high side with reference to rectification ground.
Mains switch M1 and inductor L_bb connects with the sense resistor Rsns between commutating voltage terminal 10 and rectification earth terminal 12.In this circuit topological structure, during secondary stroke, on-off controller 6 ' can the converter output voltage at direct sensing BCM detection terminal DET place, and if this value becomes too high, then takes action.The same circuits of the degaussing that topological structure can be driven to cause because of high side by detection in on-off controller 6 ' is to provide overvoltage protection; this is impossible in the circuit with low side drive topological structure, needs to use auxiliary winding to realize the sensing of excessive voltage condition in the circuit with low side drive topological structure.
Adjust the internal placement of light level controller 7 ' (intercepting shown in part in Fig. 4) similar to Fig. 2.But in the buck-boost switch topology of high side, buck-boost inductor is connected to rectification ground GND
rECTwith floating ground GND
fLOATbetween.Utilize the character that the average voltage at inductor L_bb two ends (maximum is the three ten-day period of hot season) is little compared with the amplitude of rectified input signal, by carrying out dividing potential drop and filtering to the commutating voltage relative to floating ground, the dimming control signal of the average voltage impact being only subject to inductor two ends a little can be obtained.Can find out, by utilizing this character of inductor, this seems inconvenient high-side driver attribute at first with needing two references can to solve circuit in the mode of cost-effective.Therefore, tune light level controller 7 ' can by floating ground GND
fLOAT, but not rectification ground GND
rECTas its reference.
In main stroke, on-off controller 6 ' switches on power switch M1, makes electric current (during main stroke) during predetermined turn-on time in inductor L_bb increase.After turn-on time, disconnecting power switch M1, and discharge the magnetic energy be stored in inductor L_bb.On-off controller 6 ' utilizes BCM to monitor the end of the input time stroke at terminal DET place.
During secondary stroke, on-off controller 6 ' determines by the voltage sensing sense resistor Rsns two ends the electric current being passed to LED strip.Sensing voltage compares with the dimmer voltage signal received at light modulation input terminal DIM place by on-off controller 6 ', and regulates mains switch M1 in the turn-on time of next cycle, and delivered current is matched with the desired grade corresponding to dimmer voltage signal.
Fig. 5 shows the signal overview of Fig. 4 circuit during two HF switch cycles 54 and 56, comprises the voltage 50 at the inductor two ends of the function as the time and flows through the electric current 52 of inductor.
The voltage 50 at inductor two ends the main stroke 58 of each switch periods 54 and 56 have fixing on the occasion of, and at the secondary stroke 60 of each switch periods 54 and 56, there is fixing negative value.For ideal inductor, the time average voltage in whole switch periods 54 and 56 is 0V.
Shown inductor current 52 operates in the feature of the SMPS in the conduction mode of border; Electric current in inductor is increased to maximum I_ind from zero linearly during main stroke, and drops to 0A from maximum I_ind during secondary stroke.Once electric current 52 drops to zero at the end of the secondary stroke 60 of previous switch periods 54, next switch periods 56 starts.
Inductor current 52 is just at main stroke 58 and time stroke 60, and therefore, have in the imperfect situation of series resistance (ESR) at inductor, average inductor current will cause the bias voltage 62 at buck-boost inductor two ends.Size and the inductor current 52 of bias voltage 62 are in direct ratio.In the example of fig. 4, due to the ground of the voltage divider reference IC for obtaining average dimmer voltage signal (floating), from rectified voltage signal, any ESR bias voltage is deducted.Voltage level and the diode voltage at ESR two ends have identical order of magnitude, therefore very little compared with can being the rectified voltage signal of hundreds of volts.Be with the ground of on-off controller voltage divider as a reference (such as owing to adjusting the feature of light level controller, the dividing potential drop factor can be 1/100), therefore, the voltage difference adjusted between the dimmer voltage signal output of adjusting light level controller in the output of the dimmer voltage signal of light level controller and Fig. 4 can be ignored in Fig. 2, and in some applications, think that this voltage difference can accept.
Fig. 6 shows another schematic diagram of high side buck-boost light modulation transducer (SMPS) 34 similar with Fig. 4.Most of parts similar between Fig. 4 and Fig. 6 circuit will be no longer discussed below.
The filter circuit 16 similar to the filter circuit described with reference to figure 2 is provided in SMPS34.Between the second terminal that second regulating capacitor CF2 is connected to adjustment inductor Lf and rectification earth terminal 12.Additional adjusting circuits assembly 17 is set and is connected to commutating voltage terminal 10 to make IC voltage terminal Vcc.Source resistance device R2 and R4 of series connection is provided between IC voltage terminal Vcc and second terminal of adjustment inductor Lf.For 230V main line, two source resistance device R2 and R4 are for the treatment of high rail voltage.Buffer condenser C3 is provided between IC voltage terminal Vcc and floating ground terminal 13.
Except the terminal discussed about the controller of Fig. 4, on-off controller 6 " also there is switch terminal SW, but there is no gate terminal.Mains switch M1 has the drain electrode be connected with commutating voltage terminal 10 and the source electrode be connected with switch terminal SW.Sense resistor Rsns and inductor L_bb is in series arranged on rectification earth terminal 12 and on-off controller 6 " sensing terminals SEN between.Therefore, via on-off controller 6 " in second switch device, and inductor L_bb in series provides the conductive channel of mains switch M1 (at its source electrode with between draining).
In this illustration, on-off controller 6 " grid of not driving power switch M1; on-off controller 6 " use so-called " source electrode switch ", in " source electrode switch ", the grid of mains switch M1 be connected to fixed voltage and second switch devices in series be arranged on mains switch M1 source electrode and sense resistor Rsns between.Second switch device resides in on-off controller 6 " in, and receive the signal closely similar with the signal in the example of Fig. 2 and 4.Electric current in M1 only just flows when second switch conducting.The advantage of source electrode switch topology is, significantly can reduce the current drain (such as, with 10 for the factor) of on-off controller.The reason that current drain reduces is, as switch connection (turnon), provide mains switch M1 to need the gate charge being used for starting conducting from buffer condenser C3, when disconnecting (turnoff), electric charge gets back to buffer condenser C3.It should be noted that, in the switch topology of Fig. 2, often upon opening, gate charge is lost to ground.The on-off controller 6 of Fig. 6 " still need to provide the gate charge that second switch is connected, but due to on-off controller 6 " comprising low-voltage switches, the amount of institute's energy requirement can be the amplitude of lower amounts level.
Adjust light level controller 7 " comprise the Zener diode Z be connected between commutating voltage terminal 10 and rectification earth terminal 12
dand voltage divider.Voltage divider has the first voltage grading resistor Rdiv1 and the second voltage grading resistor Rdiv2.First voltage grading resistor Rdiv1 is arranged on Zener diode Z
dwith second between voltage grading resistor Rdiv2.By Zener diode Z
d, from tangent commutating voltage V
rECTdeduct a voltage.
In this illustration, dimmer voltage signal V
dIMmaximum be set as 2V.Voltage divider also reduces tangent commutating voltage and makes tangent commutating voltage and on-off controller 6 " the rated voltage of light modulation input terminal DIM suitable.
Average capacitor Cavg is in parallel with the second voltage grading resistor Rdiv2.First pole plate of average capacitor Cavg is connected to the node between the first voltage grading resistor Rdiv1 and the second voltage grading resistor Rdiv2.Relative to floating ground terminal 13, provide dimmer voltage signal V at first pole plate place of average capacitor Cavg
dIM, as the voltage being arranged in parallel two ends of average capacitor Cavg and the second voltage grading resistor Rdiv2.
Dimmer voltage signal V
dIMon average voltage be:
Wherein
represent light modulation phase corner cut,
V
mainsthe root mean square line voltage distribution at input terminal 8 place,
V
dthe voltage drop of bridge rectifier 9,
V
zzener standoff voltage, and
V
eSRbe voltage raising and reducing inductor ESR on voltage drop:
V
ESR＝I
avg(LED)·ESR
L_bb。
In this illustration, light level controller 7 is adjusted " also comprise bias capacitor Cbias.Bias capacitor Cbias has the first pole plate and the second pole plate.First pole plate of bias capacitor Cbias is connected to voltage divider (more specifically the first voltage grading resistor Rdiv1) and Zener diode Z
dbetween node, the second pole plate is connected to rectification earth terminal 12.
The effect of bias capacitor Cbias is, at Zener diode Z
dthe continuous forward current of middle generation, therefore, it is possible to provide constant Zener voltage to fall.In addition, bias capacitor Cbias can stop the comparatively low frequency commutating voltage of main line, therefore can minimize from Zener diode Z
dsupplementary load loss.
Ancillary relief terminal COM (such as, relevant with the RC pin of NXP integrated circuit numbering SSL2101) is connected to floating ground terminal 13 by filtering capacitor C8, with stable feedback loop.On-off controller 6 " BCM detection terminal DET detect resistor R5 via first and be connected to inductor L_bb, and detect resistor R3, R11 by second and be connected to rectification ground.
Alternatively, booster resistor (not shown) can be connected to on-off controller 6 " light modulation input terminal DIM and reference voltage source V
rEFbetween (not shown), to provide fixed bias for dimmer voltage signal.Can provide relative to floating ground GND
fLOATreference voltage V
rEF.Fixed bias can increase the current drain of the dimmer from low dimmer conduction angle, can improve the stability of dimmer like this.Fixed bias can produce most low dimming level, to prune (clip) dimmer voltage signal in minimum light modulation placement.
Fig. 7 shows the dimmer voltage signal curve 70 relative to phase corner cut, and the buck-boost light modulation transducer by Fig. 6 arranges phase corner cut.The following operating condition of dimmer voltage signal curve 70 and Fig. 6 circuit is about the AC main line of 120V, R
div1=24k, R
div2=820k, V
z=33V, V
d=0.56V, V
eSR=0 (ESR ~ 0 ohm, V
eSR< < Vmains).On light modulation pin, the tangent voltage of first 35 degree is greater than 2V.This compensates the line voltage fluctuates down to specified rail voltage 20%, and allows them to pass through as voltage dim signal.
Will be appreciated that, substituting as buck-boost converter, device disclosed herein can relate to a kind of flyback converter.Such as, the disclosure also relates to a kind of flyback converter, comprising:
Commutating voltage terminal and rectification earth terminal, for receiving the tangent voltage of rectification;
There is the transformer of armature winding;
Mains switch, with described primary windings connected in series between described commutating voltage terminal and described rectification earth terminal;
On-off controller, there is floating ground terminal and light modulation input terminal, wherein said light modulation input terminal is for receiving the dimmer voltage signal of the required light modulation level of instruction, described on-off controller is configured to switch according to described dimmer voltage signal controlling, and described armature winding is connected between described rectification earth terminal and described floating ground terminal; And
Adjust light level controller, be configured to, relative to described floating ground terminal, arrange described dimmer voltage signal according to the tangent voltage of described rectification.
Be appreciated that any assembly of coupling with illustrating described herein or connection can be coupled directly or indirectly or be connected.That is, one or more assembly can be located at and be called between coupling or two assemblies connecting, still can realize the required function realized simultaneously.
Claims (15)
1. a switched-mode power supply, comprising:
Commutating voltage terminal and rectification earth terminal, for receiving the tangent voltage of rectification;
Mains switch and inductance unit, be connected between described commutating voltage terminal and described rectification earth terminal;
On-off controller, there is floating ground terminal and light modulation input terminal, wherein said light modulation input terminal is for receiving the dimmer voltage signal of the required light modulation level of instruction, described on-off controller is configured to switch according to described dimmer voltage signal controlling, and described inductance unit is connected between described rectification earth terminal and described floating ground terminal; And
Adjust light level controller, be configured to, according to the tangent voltage of described rectification, arrange described dimmer voltage signal relative to described floating ground terminal.
2. switched-mode power supply according to claim 1, wherein provides described dimmer voltage signal with reference to floating.
3. the mode power that opens the light according to claim 1 and 2, it is within one or more half periods of the tangent voltage of rectification that wherein said tune light level controller is configured to described dimmer voltage signal setting, relative to the mean value of a part for the tangent voltage of described rectification of described floating ground terminal.
4. switched-mode power supply according to claim 3, also comprise the voltage divider with the first voltage grading resistor and the second voltage grading resistor, wherein said voltage divider is connected between the tangent voltage terminal of described rectification and described floating ground terminal, and the Nodes of described dimmer voltage signal between described first voltage grading resistor and described second voltage grading resistor can be used.
5. switched-mode power supply according to claim 4, also comprise and be connected on Zener diode between the tangent voltage terminal of described rectification and described floating ground terminal and average capacitor, described average capacitor has the first pole plate and the second pole plate, wherein said second pole plate is connected to described floating ground terminal, described first pole plate is connected to described first voltage grading resistor, described first voltage grading resistor is in series arranged between described Zener diode and described average capacitor, and described second voltage grading resistor is in parallel with described average capacitor.
6. the switched-mode power supply according to claim 4 or 5, also comprise the bias capacitor with the first pole plate and the second pole plate, first pole plate of described bias capacitor is connected to the node between described Zener diode and described first voltage grading resistor, and the second pole plate of described bias capacitor is connected to described rectification earth terminal.
7. the switched-mode power supply according to any one of claim 3 to 6, wherein said average dimmer voltage signal is:
Wherein
represent light modulation phase corner cut, V
mainsthe root mean square line voltage distribution at input terminal place, V
dthe voltage drop of bridge rectifier, V
zzener standoff voltage, and V
eSRit is the voltage drop in described inductance unit.
8. the switched-mode power supply according to aforementioned any one claim, comprising: be connected to the booster resistor between described light modulation input terminal and reference voltage, to provide constant offset to described dimmer voltage signal.
9. the switched-mode power supply according to aforementioned any one claim, comprising: be connected between described mains switch and described commutating voltage terminal, or the filter circuit between described commutating voltage terminal and described rectification earth terminal.
10. the switched-mode power supply according to aforementioned any one claim, wherein said inductance unit has the resistance between 0.1 ohm to 20 ohm.
11. switched-mode power supplies according to aforementioned any one claim, comprise buck-boost converter.
12. switched-mode power supplies according to any one of claim 1 to 9, comprise flyback converter, and wherein said inductance unit is the armature winding of the transformer of described flyback converter.
13. switched-mode power supplies according to aforementioned any one claim, wherein said tune light level controller and described on-off controller are set up in a single package.
14. switched-mode power supplies according to claim 13, wherein said mains switch is also arranged in described single package.
15. 1 kinds of solid-state lighting units, comprise the switched-mode power supply SMPS described in aforementioned any one claim.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14171606.8A EP2953426B1 (en) | 2014-06-06 | 2014-06-06 | Switched mode power supply |
| EP14171606.8 | 2014-06-06 |
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| Publication Number | Publication Date |
|---|---|
| CN105323907A true CN105323907A (en) | 2016-02-10 |
| CN105323907B CN105323907B (en) | 2018-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510303313.9A Active CN105323907B (en) | 2014-06-06 | 2015-06-04 | Switched-mode power supply |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US9532418B2 (en) |
| EP (1) | EP2953426B1 (en) |
| CN (1) | CN105323907B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111526639A (en) * | 2020-04-24 | 2020-08-11 | 科博达技术股份有限公司 | Method and device for improving output current precision of constant current Buck circuit |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9831772B1 (en) * | 2014-03-17 | 2017-11-28 | Marvell International Ltd. | Resonant converter with synchronous rectifier feedback |
| KR20160055696A (en) * | 2014-11-10 | 2016-05-18 | 페어차일드코리아반도체 주식회사 | Control system for phase-cut dimming |
| US10034355B2 (en) | 2015-05-28 | 2018-07-24 | Technical Consumer Products, Inc. | Driver circuit for providing constant voltage to an auxiliary circuit |
| CN108923390B (en) * | 2016-03-29 | 2020-01-07 | 昂宝电子（上海）有限公司 | System and method for overvoltage protection of LED lighting |
| CN107071995B (en) * | 2017-01-06 | 2019-07-30 | 周顺花 | A kind of automobile-used daytime running lights control circuit |
| CN107454708A (en) * | 2017-05-26 | 2017-12-08 | 厦门奇力微电子有限公司 | A kind of high PF, the LED driver circuit of controllable silicon light modulation |
| TWI715468B (en) * | 2020-03-18 | 2021-01-01 | 宏碁股份有限公司 | Buck converter |
| CN114745829A (en) * | 2022-04-15 | 2022-07-12 | 厦门普为光电科技有限公司 | High-efficiency light-emitting diode driving circuit and high-efficiency light-emitting diode lighting device |
| CN115037161A (en) * | 2022-07-01 | 2022-09-09 | 广东开利暖通空调股份有限公司 | Switching power supply protection circuit and power supply system |
| CN115589160B (en) * | 2022-12-12 | 2023-03-10 | 季华实验室 | Control power generation circuit and method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101489336A (en) * | 2008-12-18 | 2009-07-22 | 英飞特电子（杭州）有限公司 | Constant current source control circuit |
| CN102137534A (en) * | 2011-01-26 | 2011-07-27 | 深圳茂硕电源科技股份有限公司 | Virtual ground type high-voltage constant-current circuit |
| CN102420527A (en) * | 2010-09-24 | 2012-04-18 | 三垦电气株式会社 | Direct-current power supply device |
| CN102655700A (en) * | 2012-02-21 | 2012-09-05 | 陈龙 | Control method of continuous current detection and floating based constant-current LED (light-emitting diode) driver |
| CN103079323A (en) * | 2013-02-06 | 2013-05-01 | 杭州士兰微电子股份有限公司 | Non-isolated LED (Light Emitting Diode) drive circuit not powered by auxiliary winding |
| CN103457489A (en) * | 2013-09-25 | 2013-12-18 | 无锡莱士电子科技有限公司 | Switching mode power system and power supply circuit thereof |
| US20140062319A1 (en) * | 2012-09-03 | 2014-03-06 | Beyond Innovation Technology Co., Ltd. | Light-emitting diode driving apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8154221B2 (en) * | 2007-12-21 | 2012-04-10 | Cypress Semiconductor Corporation | Controlling a light emitting diode fixture |
| US8698419B2 (en) * | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| EP2440020B1 (en) | 2010-10-07 | 2016-12-28 | Silergy Corp. | Generation from phase cut dimmer output with fast response to changes in dimmer position |
| CN102821509A (en) * | 2011-06-08 | 2012-12-12 | 聚积科技股份有限公司 | AC/DC dual-purpose LED drive circuit |
-
2014
- 2014-06-06 EP EP14171606.8A patent/EP2953426B1/en active Active
-
2015
- 2015-05-15 US US14/713,982 patent/US9532418B2/en active Active
- 2015-06-04 CN CN201510303313.9A patent/CN105323907B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101489336A (en) * | 2008-12-18 | 2009-07-22 | 英飞特电子（杭州）有限公司 | Constant current source control circuit |
| CN102420527A (en) * | 2010-09-24 | 2012-04-18 | 三垦电气株式会社 | Direct-current power supply device |
| CN102137534A (en) * | 2011-01-26 | 2011-07-27 | 深圳茂硕电源科技股份有限公司 | Virtual ground type high-voltage constant-current circuit |
| CN102655700A (en) * | 2012-02-21 | 2012-09-05 | 陈龙 | Control method of continuous current detection and floating based constant-current LED (light-emitting diode) driver |
| US20140062319A1 (en) * | 2012-09-03 | 2014-03-06 | Beyond Innovation Technology Co., Ltd. | Light-emitting diode driving apparatus |
| CN103079323A (en) * | 2013-02-06 | 2013-05-01 | 杭州士兰微电子股份有限公司 | Non-isolated LED (Light Emitting Diode) drive circuit not powered by auxiliary winding |
| CN103457489A (en) * | 2013-09-25 | 2013-12-18 | 无锡莱士电子科技有限公司 | Switching mode power system and power supply circuit thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111526639A (en) * | 2020-04-24 | 2020-08-11 | 科博达技术股份有限公司 | Method and device for improving output current precision of constant current Buck circuit |
| CN111526639B (en) * | 2020-04-24 | 2022-07-19 | 科博达技术股份有限公司 | Method and device for improving output current precision of constant current Buck circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105323907B (en) | 2018-10-19 |
| EP2953426A1 (en) | 2015-12-09 |
| US20150359052A1 (en) | 2015-12-10 |
| US9532418B2 (en) | 2016-12-27 |
| EP2953426B1 (en) | 2017-08-30 |
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